I am collecting number systems of world languages. The languages shown below are listed according to the complexity of the way of counting numbers in my opinion.

I translate words included in number words to English, and I use '+' and '×' for implicit additions and multiplications. For instance, I explain the French words vingt et un (21) and quatre-vingt-dix-neuf (99) as "20 and 1" and "4 × 20 + 10 + 9" respectively.

Please let me know if you find a mistake. A list of numbers in your language is welcome.

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Surprisingly enough, it's proven that Chinese-speaking children are better at counting numbers than English-speaking counterparts because of their language. Bilingual children are better at counting when they think in Chinese than in English. The irregularity of the English number system makes it harder for children to count numbers properly.